rework pb interface for easier usability

enstools/feature/__init__.py

...e/identification/_proto_gen/african_easterly_waves_pb2.py

...s/feature/identification/_proto_gen/identification_pb2.py

...ools/feature/identification/_proto_gen/pv_streamer_pb2.py

enstools/feature/identification/_proto_gen/template_pb2.py

...ation/african_easterly_waves/african_easterly_waves.proto

...eature/identification/african_easterly_waves/filtering.py

...e/identification/african_easterly_waves/identification.py

enstools/feature/identification/identification.proto

enstools/feature/identification/identification.py

...ools/feature/identification/pv_streamer/pv_streamer.proto

enstools/feature/identification/subset_accessor_TODELETE.py

enstools/feature/identification/template/identification.py

enstools/feature/identification/template/template.proto

enstools/feature/tracking/object_compare_tracking.py

enstools/feature/tracking/template/tracking.py

...ools/feature/tracking/template_object_compare/tracking.py

enstools/feature/tracking/tracking.py

enstools/feature/util/pb2_properties_api_TODELETE.py